docs: def processVREvent(self, event):
          "Purpose: Processes a single VR event"
          et = event.eventType
          if et == openvr.VREvent_TrackedDeviceActivated:
              self.setupRenderModelForTrackedDevice( event.trackedDeviceIndex )
              dprintf( "Device %u attached. Setting up render model.\n" % event.trackedDeviceIndex )
          elif et == openvr.VREvent_TrackedDeviceDeactivated:
              dprintf( "Device %u detached.\n" % event.trackedDeviceIndex )
          elif et == openvr.VREvent_TrackedDeviceUpdated:
              dprintf( "Device %u updated.\n" % event.trackedDeviceIndex )